Home / 7,129.89-9,839.57-3,986.08

Finding the Fourth Proportional to 7,129.89, 9,839.57 and 3,986.08

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Solution

The fourth proportional to 7,129.89, 9,839.57 and 3,986.08 is: 5,500.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,129.89 : 9,839.57 = 3,986.08 : x
  2. Step 2: Convert to fraction form
    7,129.89/9,839.57 = 3,986.08/x
  3. Step 3: Cross multiply
    7,129.89x = 9,839.57 × 3,986.08
  4. Step 4: Simplify right side
    7,129.89x = 39,221,268.66
  5. Step 5: Solve for x
    x = 39,221,268.66/7,129.89
  6. Step 6: Final answer
    x = 5,500.96

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.